Tag: "sex" at biology news
UCLA scientists find male gene in brain area targeted by Parkinson's
UCLA scientists have discovered that a sex
gene responsible for making embryos male and formi...gender and makes embryos male. Located on the male sex
chromosome, SRY manufactures a protein that is secreted by cells in the testes. Now, in an unexpecte...
...ansform, over a week, into a male, changing color, sex
organs, and behavior to act as the new male over the remaining females....
First wolverine radio-collared in Pacific Northwest
...lo gulo) weigh about 20 to 40 pounds, depending on sex
and age, and are the largest land-based member of the mustelid family that includes weasels, badgers, and otters. They are primarily found in boreal forest and tundra habitats in the far north, but also occur in mountainous terrain at the southern en...
Sex, cleaner of genomes
...r studies. The finding supports a hypothesis that sex
is an evolutionary housekeeper that adeptly reorde...s that meander into asexuality. "It is known that sex
is common in plants and animals, and that asexual species are typically short-lived, but why this sh...
Americans prefer to leave child's sex to chance, survey finds
Most people would not choose the sex
of their child if given the option, according to a...he first to examine the demand and preferences for sex
selection among the U.S. general population. "We found that only 8 percent of people would use pre-i...
Aggressive subtype of breast cancer displays 'misbehavior' of X chromosomes
...n a mechanism that contributes to the stability of sex
chromosomes in women. In mammals, male cells contain an X and a Y chromosome, while female cells contain two X chromosomes. Normally, a process called X inactivation occurs in early female embryos; it leads to silencing of one of the two X chromosome...
FSU biologist says new dinosaur is oldest cousin of Tyrannosaurus rex
...g monster of "Jurassic Park" movie fame. While the sex
of the two T. rex cousins was impossible to ascertain, Erickson determined their respective ages by examining the growth rings on the inside of their bones. Those of the larger animal had seven closely spaced rings revealing rapid growth to young ad...
Inflammatory reaction drives hormone resistance in cancer, study suggests
...n of the androgen receptor that is specific to all sex
steroid receptors, including the estrogen and prog... "local expression of genes otherwise repressed by sex
hormone receptors." Such mechanisms may play an important role in various reproductive processes, su...
Sex: It's costly but worth it. Just ask a microbe
...ssor of biology at McMaster University, found that sex
exacts physical, morphological and behavioural str...s own." The irony is that despite the high cost of sex
there are benefits. "In many microbes, mating and sexual reproduction produce genetically diverse a...
Growing evidence of sex-based differences in lung cancer highlighted at roundtable meeting
... we need more research to understand the impact of sex
and gender on the development and treatment of lun...search to talk about ways to increase awareness of sex
differences in lung cancer risk and treatment approaches were the American Society for Clinical Onco...
New brain hormone puts brakes on reproduction
... the hormones stimulate production of estradiol, a sex
steroid hormone and the body's main form of estrog...mones, establishing feedback that keeps the body's sex
hormones on an even keel. Estradiol also works higher in the brain, on the hypothalamus, to ramp dow...
Women pregnant with girls experience more severe asthma symptoms
...largest studies to investigate the effect of fetal sex
on the severity of the mother's asthma, and one of the largest to investigate the effect of fetal sex
on any disease of the mother," said senior author Michael B. Bracken, Susan Dwight Bliss Professor o...
Pesticide combinations imperil frogs, probably contribute to amphibian decline
...zing males into hermaphrodites - frogs with female sex
organs invading their testes - decreasing the size of their vocal organs, which are critical to mating success, and causing a tenfold drop in testosterone in mature male frogs. In the current study, he looked again at atrazine as well as three other ...
HIV prevention hope: Yogurt bugs that make antiviral drugs
...ed to, or inserted into, the vagina or anus before sex
to prevent HIV transmission. Scientists around the world are trying to develop these topical drugs as weapons in the battle against HIV/AIDS, which has killed more than 25 million people. According to the World Health Organization, this makes the HIV...
Other highlights in the January 18 JNCI
...tudies have suggested that increased levels of the sex
hormones estradiol and testosterone and decreased levels of a protein that binds to sex
hormones called sex
hormone-binding globulin are associated with an increased risk of breast cancer ...
VCU study suggests that heritability of major depression is higher in women than in men
...genetic factors that are operating uniquely in one sex
and not in the other. In the January issue of the...isk for depression in a woman's response to cyclic sex
hormones, particularly in the postpartum period. Such genes would impact a woman's risk for major de...
Females, alcohol and hormones
...ts that there is something unique about the female sex
that lends it to being so susceptible to alcohol's... cycle," she explained. "In both humans and rats, sex
hormone levels rise and fall in a cyclical pattern. Furthermore, rats are a useful and practical mo...
Rutgers researchers scientifically link dancing ability to mate quality
... fellow William Brown also examined results by the sex
of the dancer. They found that symmetric males received better dance scores than symmetric females and that female evaluators rated symmetric men higher than male evaluators rated symmetric men. "In species where fathers invest less than mothers in t...
Food additive inhibits longevity enzyme in yeast, increases cell toxicity, new study finds
... yeast. The haploid yeast strains, like gametes or sex
cells, contained only one set of chromosomes, and would not normally grow on the medium prepared in the lab. However, if the haploid yeast strains were exposed to an agent that disrupted sirtuin activity, epigenetic silencing would be reversed, the s...
Learning about sex from an elegant worm
... equipped to meet life's challenges. The secret of sex
is meiosis, a specialized kind of cell division in... are five pairs of nonsex chromosomes and a single sex
chromosome, the X. An animal that inherits two Xs becomes a hermaphrodite; a single X chromosome (X0...
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